1. Immunization Unit, Robert Koch Institute, Seestraße 10, 13353 Berlin, Germany
2. Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany
3. Bavarian Health and Food Safety Authority (LGL), Veterinärstraße 2, 85764 Oberschleißheim, Germany
4. Faculty of Medicine, Institute of Social Medicine and Health Systems Research, Otto-von-Guericke-University Magdeburg, 39120 Magdeburg, Germany
5. State Health Office Baden-Wuerttemberg (LGA), Nordbahnhofstraße 135, 70191 Stuttgart, Germany